package com.itheima.controller;

import com.itheima.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.UUID;

/**
 * @Auther: guozy
 * @Date: 2022/7/31 - 07 - 31 - 14:35
 * @Description: com.itheima.controller
 * @version: 1.0
 */
@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;

    /**
     * 文件下载
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        // 打印日志
        log.info(file.toString());

        //原始文件名
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));

        File dir = new File(basePath);
        if (!dir.exists()){
            //目录不存在,需要创建
            dir.mkdir();
        }

        //使用UUID重新生成文件名
        String fileName = UUID.randomUUID().toString() + suffix;
        try {
            // 将临时文件转存到指定位置
            file.transferTo(new File(basePath+fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);
    }

    /**
     * 文件上传
     * @param name
     * @param response
     */

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response ){
        try {
            // 输入流,通过输入流读取文件
            FileInputStream fis = new FileInputStream(new File(basePath + name));

            //输出到浏览器
            ServletOutputStream os = response.getOutputStream();
            response.setContentType("image/jpeg");
            //写
            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len=fis.read(bytes))!=-1){
                os.write(bytes,0,len);
                os.flush();
            }
            //关闭资源
            os.close();
            fis.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
